Safety-valve



(No Model.)

C. S. WAYBRIGHT.. SAFETY VALVE.

No. 590,195.` Patented Sept. 14,1897. Y

UNTTED STATES PATENT EEicE SAFETY-VALVE.

SPECIFICATION forming part of Letters Patent No. 590,195, datedSeptember 14, V189'?. Y Applicationiiled December 16, 1896. Serial No.615,909. (N0 model.)

T all whom, tm/ag concern:

Be it known that I., CHARLES SWITZEE IVAYBRIGHT, a citizen of theUnitedStates, residing at Crabbottom, in the county of Highland andState of Virginia, have invented a new and useful Safety-Valve, of whichthe following is a specification.

My invention relates to uid pressure safety or relief valves for use inconnection with pumps and other mechanisms in which the parts areexposed to variable iiuid-pressure or wherein obstructions are liable toocarrangement of parts whereby the device is adapted to be applied withfacility to a pipe or conductor exposed to fluid-pressure, and,furthermore, to provide a construction wherein the tension of theactuating spring is adapted to be adjusted with facility.

Further objects and advantages of this in vention will appear in thefollowing description, and the novel features thereof will beparticularly pointed out in the appended claims.

In the drawings, Figure 1 is a central sectional view of a safetyvalveconstructed in accordance with my invention. Fig. 2 is a side view,partly in section, of the same, showing the delecting-hood inverted toadapt the device for use as a steam safety-valve, the key, which isemployed for adj Listing the tension of the valve-actuating spring,being shown in operative position.

Similar numerals of reference indicate corresponding parts in bothfigures of the drawl ings.

same with vents preferably formed in annular `series in a thickenedportion 5 of the wall of the casing, said thickened portion or bossbeing exteriorly threaded for engagement by a reversible hood 6. Thishood is of annular construction, provided at one edge with an i'ntur'nedinteriorly-threaded flange 7 to engage the threadsof the boss, and whenthe valve is used in connection with' pumps to regulate the pressure ofthe liquid passing therethrough this hood is preferably arranged in thedownturned position illustrated in Fig. l, whereby the liquid, afterescaping through the vents, is deflected downwardly and escapes betweenthe lower or free edge of the hood and the cut-away or chamfered edgesof the wrench-seat 7n. r

In Fig. 2 the hood is shown inverted or with its free edge upturned andits threaded flange arranged below theplane of the vents, whereby thevalve is adapted for use in connection with vapor-pressure, as inconnection with a steam-engine.

The valve 8 is provided with an actuatingspring 9, which normally holdsit seated, and the upper extremity of the valve-stem 10 extends into thetubular guide 1l, while a collar 12 on said guide bears upon the upperend of the actuating-spring, and this guide is adj ustably fitted, asthreaded, in an axial bore provided for its reception in the casing-head13. The upper extremity of the tubular guide is squared to form awrench-seat 14, which is arranged in an interiorly-threaded socket l5 insaid casing-head, the upper end of the socket being closed by aremovable cap 16.

From the above description it will be seen that when the pressure in apipe or conductor to which the valve is attached exceeds that for whichthe valve is set the latter will be unseated to allow the escape offluid and hence the reduction of pressure, and in order to regulate thevalve-spring to correspond with the desired pressure it may beaccomplished by means of a key 17, (shown in Fig. 2,) which is appliedtothe wrench-seat at the upper extremity of the valve-stem guide, thecap in the socket formed in the casinghead being previously removed.

` It will be seen, furthermore, thatthe boss in which the vents areformed is Athreaded continuously from a point above to a point below theplane of the vents to provide for the inversion of the hood.Furthermore, it

is obvious that when used as a safety or relief valve for steam thedevice may be applied directly to the steam-dome of a boiler, the

casing 2 being of course detached from the IOO coupling 1, which ismerely shown in connection With the drawings to illustrate the means ofattachment to a pipe.

Various changes in the form, proportion, and the minor details ofconstruction may be resorted to Without departing from thespirit orsacriiicin g any of the advantages of this invention.

Having described my invention, what I claim is- .1. Avalve of the classdescribed, having its casing pro vided with lateral vents and acontiguous valve-seat, a normally-seated yielding valve controlling saidvents, and a defiecting hood, open at one side, provided with aninterior flange threaded exteriorly upon the casing contiguous to theplane of saidvents and adapted to be reversed to extend either upwardlyor downwardly thereover, said interior iiange of the hood being of athickness equal to the diameter of the vents, and the cylinder beingthreaded upon each side of the plane of the vents a distance equal tothe thickness of said flange, to provide for arranging the flange uponeither side of the plane of the vents, substantially as specified.

2. A valve of the class described, having its casing provided withlateral vents and a contiguous valve-seat, a normally-seated yieldingvalve controlling said vents, a head removably fitted in and coextensiveWith the casing and provided at the inner end of its bore With athreaded portion, a valve-stein guide adj ustably fitted in the threadedportion of the bore of the head and provided at its outer extremity Witha Wrench-seat, said guide being provided With a collar of smallerdiameter than the interior of the casing to engage the contiguousextremity of a valveactuating spring, and a cap removably fitted in acounterbored and threaded portion of said head to normally conceal andgive access to the Wrench-seat of the guide, substantially as specified.

In testimony that I claim the foregoing as my own I have hereto afiixedmy signature in the presence of tWo Witnesses.

CHARLES SWITZER WAYBRIGHT.

Witnesses MINOR K. SIMMONS, EMoRY N. WIMER.

